How do you factor #ab - 5a + 4b - 20?

Question

1280 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2015-05-14T16:36:00

#ab - 5a + 4b - 20#

Group

#color(red)((ab-5a))+color(blue)((4b-20))#

Extract factor from each group

#color(red)((a)(b-5)) +color(blue)((4)(b-5))#

Extract the #(b-5)# factor from each term

#(color(red)(a)+color(blue)(4))(b-5)#